55221771 has 32 divisors (see below), whose sum is σ = 87494400. Its totient is φ = 30602880.

The previous prime is 55221769. The next prime is 55221821. The reversal of 55221771 is 17712255.

55221771 = T₁₄₃ + T₁₄₄ + ... + T₆₉₃.

55221771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55221771 - 2¹ = 55221769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55221701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16665 + ... + 19701.

It is an arithmetic number, because the mean of its divisors is an integer number (2734200).

Almost surely, 2^55221771 is an apocalyptic number.

55221771 is a deficient number, since it is larger than the sum of its proper divisors (32272629).

55221771 is a wasteful number, since it uses less digits than its factorization.

55221771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3099.

The product of its digits is 4900, while the sum is 30.

The square root of 55221771 is about 7431.1352430164. The cubic root of 55221771 is about 380.8057027656.

The spelling of 55221771 in words is "fifty-five million, two hundred twenty-one thousand, seven hundred seventy-one".